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Verify the "Place volume icon in the taskbar" checkbox is checked. If this option is not available or is grayed out, skip to the next section of this document.

If you were able to check this box, click ok and close out of this window and the Control Panel.

Double-click the sound icon in the systray and verify that all the sound volumes are mid-way or higher.

OR Try below methods..

Method 1: Try another sound device
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If possible, plug a different output device into the computer. For example, if you have been using speakers, try a different pair of speakers or a set of headphones to make sure that the problem is not related to the device itself.

Determine whether you can hear sound. If you can hear sound, there is a problem with the original output device and the issue is resolved. If you cannot hear sound, plug the original output device back into the computer and go to method 2.
Method 2: Use the Windows XP Sound Troubleshooter
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Windows XP includes a troubleshooting program which could help you resolve your sound issues. Start the Windows XP Sound Troubleshooter automatically or manually and then answer each question on-screen in order to try to find a resolution.
Step 1: Start the Sound Troubleshooter
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If you are already familiar with Windows XP Help and Support Center, click the following link to start the Sound Troubleshooter:
Sound Troubleshooter (hcp://help/tshoot/tssound.htm)
OR

Start Sound Troubleshooter manually by using the following steps:

Click Start, and then click Help and Support.

Under Pick a Help Topic, click Fixing a problem.

In the navigation pane on the left, click Games, sound, and video problems.

In the topic pane, on the right side, click Sound Troubleshooter.

Step 2: Use the Sound Troubleshooter
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Click the option that describes the problem that is occurring, and then click Next.

Repeat step 1 until your problem is resolved or until you have reached the end of the troubleshooting path.

Note You can click Back at any time to repeat the last step, or you can click Start Over to start the Sound Troubleshooter again.

Determine whether you can now hear sound. If you can hear sound, the issue is resolved. If you cannot hear sound, try method 3.
Method 3: Update your Media Player software
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If the sound problem that you are experiencing occurs when you use a media player such as Microsoft Windows Media Player, try updating your media player software. To obtain the latest version of the Windows Media Player, visit the following Microsoft Web site: http://www.microsoft.com/windows/windowsmedia/download/AllDownloads.aspx (http://www.microsoft.com/windows/windowsmedia/download/AllDownloads.aspx)
Determine whether you can now hear sound. If you can hear sound, the issue is resolved. If you cannot hear sound, try method 4.
Method 4: Update sound drivers
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Out-of-date sound drivers may cause sound problems. Check whether an updated sound driver is available. You can use Microsoft Update to help you determine your current sound driver and if an update is available. Then contact the sound driver hardware or the computer manufacturer to request an updated sound driver.

To find out whether applicable driver updates are available, visit the following Microsoft Windows Update Web site: http://update.microsoft.com (http://update.microsoft.com)
If the sound driver is out of date, follow these steps to find the name and provider of your sound driver:

what is the error? wrong codec or no audio device installed/detected?in the case of the first problem, try downloading something like k-lite codec pack. otherwise you have the wrong audio drivers installed. for that you need your motherboard number, google for it for the right drivers, or alternatively download everest, find your audio model number, and download drivers for the mdel via google.